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Gastrointestinal infections with the drug-resistent bacteria C. difficile have become epidemic in health care settings. An odd-sounding treatment, fecal transplants, appears to help, but how should the government be regulating it?

Why do some parents doubt vaccines—even amid strong evidence that not vaccinating is dangerous? Sharon Kaufman, PhD, chair of the Department of Anthropology, History and Social Medicine at the University of California, San Francisco, weighs in.